Portion of a pipe



FIG. 1 is a cross-sectional view taken along line 1—1 in FIG. 3;

FIG. 2 is a front view showing the structure of surface of the portion of a pipe illustrated in FIG. 1;

FIG. 3 is a left side or left end view of the portion of a pipe of FIG. 2; and,

FIG. 4 is a right side or right end view of the portion of a pipe of FIG. 2. 

The ornamental design for a portion of a pipe, as shown and described. 